feat(schemas): 扩充 Task/Product Pydantic Schema

Task Schema:
- TaskResponse 新增 is_rework, reject_reason, received_at, completed_at, records, product_sn
- 新增 TaskRejectRequest, TaskTransferRequest, TaskRecordCreate, TaskRecordResponse
- TaskRecordResponse 含 json.loads 反序列化 images

Product Schema:
- ProductResponse/ProductScanResponse 新增 external_serial, current_location_id, overall_status
- ProductScanResponse 新增 task_tree (递归任务树)
- ProductCreate 改为 material_id/material_name/spec_model + external_serial + order_no 自由文本
- ProductUpdate 新增 order_no

backend/app/schemas/product.py

@@ -6,10 +6,17 @@ from pydantic import BaseModel, Field
 
 
 class ProductCreate(BaseModel):
-    """创建产品"""
-    serial_number: str = Field(..., min_length=16, max_length=16, description="产品序列号(16位)")
-    order_id: uuid.UUID = Field(..., description="所属订单ID")
-    material_id: str | None = Field(None, max_length=64, description="物料ID(逻辑外键→老系统)")
+    """创建产品 — serial_number 由后端自动生成 16 位 HEX"""
+    # MOM 物料挂载（必填）
+    material_id: str = Field(..., max_length=64, description="MOM物料ID(必选)")
+    material_name: str = Field("", max_length=255, description="物料名称")
+    spec_model: str = Field("", max_length=255, description="规格型号")
+    category: str = Field("", max_length=100, description="物料类别")
+    material_type: str = Field("", max_length=100, description="物料类型")
+    # 可选
+    external_serial: str | None = Field(None, max_length=64, description="产品序列号(用户自定义,选填)")
+    order_id: uuid.UUID | None = Field(None, description="所属订单ID(选填)")
+    order_no: str | None = Field(None, max_length=64, description="订单号(自由键入,选填)")
     parent_product_id: uuid.UUID | None = Field(None, description="父产品ID")
 
     model_config = {"from_attributes": True}
@@ -18,7 +25,11 @@ class ProductCreate(BaseModel):
 class ProductUpdate(BaseModel):
     """更新产品"""
     serial_number: str | None = Field(None, min_length=16, max_length=16)
+    external_serial: str | None = Field(None, max_length=64)
     material_id: str | None = Field(None, max_length=64)
+    material_name: str | None = Field(None, max_length=255)
+    spec_model: str | None = Field(None, max_length=255)
+    order_no: str | None = Field(None, max_length=64, description="订单号")
     status: str | None = Field(None, max_length=50, description="产品状态")
     parent_product_id: uuid.UUID | None = Field(None)
 
@@ -29,10 +40,17 @@ class ProductResponse(BaseModel):
     """产品响应"""
     id: uuid.UUID
     serial_number: str
-    order_id: uuid.UUID
+    external_serial: str | None = None
+    order_id: uuid.UUID | None = None
+    order_no: str = ""
     material_id: str | None
+    material_name: str | None = None
+    spec_model: str | None = None
+    category: str | None = None
+    material_type: str | None = None
     parent_product_id: uuid.UUID | None
     current_location_id: str | None = None
+    overall_status: str | None = None
     status: str
     created_at: datetime
 
@@ -43,11 +61,17 @@ class ProductScanResponse(BaseModel):
     """扫码查询响应 — 产品信息 + 完整任务树（递归嵌套）"""
     id: uuid.UUID
     serial_number: str
-    order_id: uuid.UUID
+    external_serial: str | None = None
+    order_id: uuid.UUID | None = None
     order_no: str = ""
     material_id: str | None
+    material_name: str | None = None
+    spec_model: str | None = None
+    category: str | None = None
+    material_type: str | None = None
     parent_product_id: uuid.UUID | None
     current_location_id: str | None = None
+    overall_status: str | None = None
     status: str
     created_at: datetime
     top_level_tasks: list[TaskSummaryResponse] = []
@@ -56,6 +80,6 @@ class ProductScanResponse(BaseModel):
     model_config = {"from_attributes": True}
 
 
-# 延迟导入，避免循环引用 — TaskSummaryResponse 在 tasks.py 中定义
-from app.schemas.task import TaskSummaryResponse  # noqa: E402
+# 延迟导入，避免循环引用
+from app.schemas.task import TaskSummaryResponse, TaskResponse  # noqa: E402
 ProductScanResponse.model_rebuild()